Brain on Fire by Susannah Cahalan

Susannah is a young woman who has worked her way through the ranks at the New York Post. She is fun-loving, smart and happy. She starts experiencing symptoms – fatigue, numbness in her limbs – which her doctor attributes to mono. Until the night that she experiences hallucinations and body convulsions. She is admitted to the hospital and won’t come out for over a month. The doctors cannot figure out what is wrong with her. She is, at turns, delusional, catatonic, and violent. Ultimately doctors discover that she has a virus that makes her body attack her brain. It is now believed that this virus is the culprit of what people believe to be demonic possession. Fascinating.